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[ALICE3] Add preselections and histogram to alice3 cascade finding #16973

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jesgum merged 1 commit into from
Jul 8, 2026
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[ALICE3] Add preselections and histogram to alice3 cascade finding #16973

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32 changes: 27 additions & 5 deletions ALICE3/TableProducer/alice3strangenessFinder.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@
#include <ReconstructionDataFormats/TrackParametrization.h>

#include <TH1.h>
#include <TLorentzVector.h>

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
#include <TPDGCode.h>

#include <sys/types.h>
Expand Down Expand Up @@ -88,6 +88,7 @@
ConfigurableAxis axisXiMass{"axisXiMass", {200, 1.22f, 1.42f}, "Xi mass axis"};
ConfigurableAxis axisOmegaMass{"axisOmegaMass", {200, 1.57f, 1.77f}, "Omega mass axis"};

ConfigurableAxis axisDCA{"axisDCA", {200, 0, 200}, "DCA axis"};
ConfigurableAxis axisEta{"axisEta", {80, -4.f, 4.f}, "Eta axis"};
ConfigurableAxis axisPt{"axisPt", {VARIABLE_WIDTH, 0.0f, 0.025f, 0.05f, 0.075f, 0.1f, 0.125f, 0.15f, 0.175f, 0.2f, 0.225f, 0.25f, 0.275f, 0.3f, 0.325f, 0.35f, 0.375f, 0.4f, 0.425f, 0.45f, 0.475f, 0.5f, 0.525f, 0.55f, 0.575f, 0.6f, 0.625f, 0.65f, 0.675f, 0.7f, 0.725f, 0.75f, 0.775f, 0.8f, 0.82f, 0.85f, 0.875f, 0.9f, 0.925f, 0.95f, 0.975f, 1.0f, 1.05f, 1.1f}, "pt axis for QA histograms"};

Expand Down Expand Up @@ -129,6 +130,7 @@

Configurable<float> v0MaxDauDCA{"v0MaxDauDCA", 0.005f, "DCA between v0 daughters (cm)"};
Configurable<float> cascMaxDauDCA{"cascMaxDauDCA", 0.005f, "DCA between cascade daughters (cm)"};
Configurable<float> cascMaxEta{"cascMaxEta", 2.5f, "DCA between cascade daughters (cm)"};
} presel;

// Operation
Expand All @@ -143,6 +145,7 @@

o2::vertexing::DCAFitterN<2> fitter;
Service<o2::framework::O2DatabasePDG> pdgDB;
static constexpr float ToMicrons = 1e+4;

// partitions for v0/casc dau tracks
Partition<Alice3TracksACTS> positiveSecondaryTracksACTS =
Expand Down Expand Up @@ -177,6 +180,7 @@

struct Candidate {
int index{-1};

// decay properties
float dcaDau{};
float eta{};
Expand Down Expand Up @@ -239,6 +243,7 @@
histos.add("hPtPosDauAfterV0Finding", "", kTH2D, {axisPt, axisPt});
histos.add("hPtNegDauAfterV0Finding", "", kTH2D, {axisPt, axisPt});
histos.add("hEventCounter", "", kTH1D, {{1, 0, 2}}); // counting processed events

auto hV0Counter = histos.add<TH1>("hV0Counter", "hV0Counter", kTH1D, {{4, 0, 4}});
hV0Counter->GetXaxis()->SetBinLabel(1, "K0S");
hV0Counter->GetXaxis()->SetBinLabel(2, "Lambda");
Expand All @@ -248,9 +253,6 @@
histos.add("hRadiusVsHitsNeg", "", kTH2D, {{400, 0, 400}, {12, 0.5, 12.5}}); // radius vs hist for MC studies
histos.add("hRadiusVsHitsPos", "", kTH2D, {{400, 0, 400}, {12, 0.5, 12.5}}); // radius vs hist for MC studies

histos.add("hXiMass", "", kTH1D, {axisXiMass});
histos.add("hOmegaMass", "", kTH1D, {axisOmegaMass});

auto hV0Building = histos.add<TH1>("hV0Building", "hV0Building", kTH1D, {{10, 0.5, 10.5}});
hV0Building->GetXaxis()->SetBinLabel(1, "Pair");
hV0Building->GetXaxis()->SetBinLabel(2, "Pdg check");
Expand All @@ -272,6 +274,12 @@
histos.add("Generated/hGeneratedAntiOmega", "hGeneratedAntiOmega", kTH2D, {{axisPt}, {axisEta}});
}

if (buildCascade) {
histos.add("CascadeBuilding/hDcaBetweenDaus", "hDcaBetweenDaus", kTH1D, {{axisDCA}});
histos.add("CascadeBuilding/hXiMass", "", kTH1D, {axisXiMass});
histos.add("CascadeBuilding/hOmegaMass", "", kTH1D, {axisOmegaMass});
}

histos.print();
}

Expand Down Expand Up @@ -585,6 +593,19 @@
continue; // failed at building candidate
}

// Apply preselections
if (cascCand.dcaDau > presel.cascMaxDauDCA) {
continue; // combined tracks should be reasonanly close
}

if (cascCand.eta > presel.cascMaxEta) {
continue; // candidate outside of acceptance
}

if (std::hypot(v0Cand.posSV[0], v0Cand.posSV[1]) < std::hypot(cascCand.posSV[0], cascCand.posSV[1])) {
continue; // causality
}

const float massXi = RecoDecay::m(std::array{std::array{cascCand.pDau0[0], cascCand.pDau0[1], cascCand.pDau0[2]},
std::array{cascCand.pDau1[0], cascCand.pDau1[1], cascCand.pDau1[2]}},
std::array{o2::constants::physics::MassLambda, o2::constants::physics::MassPionCharged});
Expand All @@ -606,8 +627,9 @@
vtx[0], vtx[1], vtx[2]);

histos.fill(HIST("hCascadeBuilding"), 4.0);
histos.fill(HIST("hXiMass"), massXi);
histos.fill(HIST("hOmegaMass"), massOm);
histos.fill(HIST("CascadeBuilding/hDcaBetweenDaus"), cascCand.dcaDau * ToMicrons);
histos.fill(HIST("CascadeBuilding/hXiMass"), massXi);
histos.fill(HIST("CascadeBuilding/hOmegaMass"), massOm);

tableA3CascadeMcLabels(cascCand.index);
tableCascIndices(0, // cascade index, dummy value
Expand Down Expand Up @@ -670,12 +692,12 @@
v0DecayVertex.push_back(negParticle.vx());
v0DecayVertex.push_back(negParticle.vy());
v0DecayVertex.push_back(negParticle.vz());
TLorentzVector posLorVector = {posParticle.px(), posParticle.py(), posParticle.pz(), posParticle.e()};

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
TLorentzVector negLorVector = {negParticle.px(), negParticle.py(), negParticle.pz(), negParticle.e()};

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
o2::track::TrackParCov posParCov;
o2::track::TrackParCov negParCov;
o2::upgrade::convertTLorentzVectorToO2Track(1, posLorVector, v0DecayVertex, posParCov);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
o2::upgrade::convertTLorentzVectorToO2Track(-1, negLorVector, v0DecayVertex, negParCov);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
if (!buildDecayCandidateTwoBody(posParCov, negParCov, vtx, v0cand))
continue;
v0CandidateIndices(collision.globalIndex(),
Expand Down
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